1.

Asteroid 9 Metis at opposition Asteroid 9 Metis makes closest approach to the Earth. Tue, 01 Jan 2013 at 02:10 EDT (4,127 days ago) in Gemini

2.

The Earth at perihelion The Earth reaches its closest point to the Sun. Tue, 01 Jan 2013 at 23:37 EDT (4,126 days ago) in Pisces

3.

Quadrantid meteor shower 2013 The Quadrantid meteor shower reaches its peak. Thu, 03 Jan 2013 (4,125 days ago) in Bootes

4.

Supernova SN2013E discovered A new supernova has been discovered in IC 2532. Thu, 03 Jan 2013 (4,124 days ago)

5.

Mercury at aphelion Mercury passes the furthest point along its orbit from the Sun. Thu, 03 Jan 2013 at 21:46 EDT (4,125 days ago) in Sagittarius

6.

Supernova SN2013G discovered A new supernova has been discovered in NGC 3947. Fri, 04 Jan 2013 (4,123 days ago)

7.

Moon at Last Quarter The Moon reaches last quarter phase – rising in the east at around midnight and appearing high in the sky by sunrise. Fri, 04 Jan 2013 at 22:58 EDT (4,124 days ago) in Virgo

8.

Lunar occultation of Spica The Moon will pass in front of Spica (Alpha Virginis), creating a lunar occultation visible from Australia, Indonesia, Christmas Island and Cocos Islands. Sat, 05 Jan 2013 at 14:54 EDT (4,123 days ago) in Virgo

9.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sun, 06 Jan 2013 at 18:42 EDT (4,122 days ago) in Libra

10.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 3°45'. Sun, 06 Jan 2013 at 20:09 EDT (4,122 days ago) in Libra

11.

Lunar occultation of Beta1 Scorpii The Moon will pass in front of Beta1 Scorpii (Acrab), creating a lunar occultation visible from French Polynesia and Pitcairn. Tue, 08 Jan 2013 at 09:01 EDT (4,120 days ago) in Scorpius

12.

January Naked Astronomy podcast released This month in Space Boffins: why space can seriously damage your Wed, 09 Jan 2013 (4,118 days ago)

13.

The Moon at perigee The Moon makes its monthly closest approach to the Earth, making it appear fractionally larger than at other times of the month. Thu, 10 Jan 2013 at 05:27 EDT (4,118 days ago) in Sagittarius

14.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 2°46'. Thu, 10 Jan 2013 at 06:35 EDT (4,118 days ago) in Sagittarius

15.

The Moon at perihelion The Moon passes its orbit's closest point to the Sun, which happens each month around the time of new moon. Fri, 11 Jan 2013 at 09:23 EDT (4,117 days ago) in Sagittarius

16.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 11 Jan 2013 at 14:44 EDT (4,117 days ago) in Sagittarius

17.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 6°25'. Sun, 13 Jan 2013 at 06:55 EDT (4,115 days ago) in Capricornus

18.

Conjunction of Venus and Pluto Venus and Pluto share the same right ascension, at a separation of 3°17'. Wed, 16 Jan 2013 at 19:59 EDT (4,112 days ago) in Sagittarius

19.

Mercury at superior solar conjunction Mercury passes around the far side of the Sun. Fri, 18 Jan 2013 at 04:09 EDT (4,110 days ago) in Sagittarius

20.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and setting in the west at around midnight. Fri, 18 Jan 2013 at 18:45 EDT (4,110 days ago) in Pisces